JP2017145573A - Noise insulation boundary floor structure and construction method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a noise insulation boundary floor and a construction method thereof, which can improve a floor impact sound insulation performance of a boundary floor and construct double slab at relatively narrow height by simple construction.SOLUTION: In a noise insulation boundary floor structure construction method, a boundary floor structure is constructed by doubly arranging concrete slabs 11, 12 across an air layer 13 in order to obtain a floor impact sound insulation performance at a floor slab of a building. A concrete double slab 10 is formed into a unit, which is installed when a building skeleton is constructed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for constructing a sound insulation floor structure of a building and a sound insulation floor structure.

Conventionally, in order to improve floor impact sound insulation performance at the floor between the upper floor and lower floor in an apartment house such as a reinforced concrete apartment, proposals have been made for the size of the air layer of the ceiling member and the surface density of the ceiling material. Has been made. For example, Patent Document 1 proposes to form an air layer having a thickness of 300 mm or more between a slab and a ceiling material, and Patent Document 2 describes the thickness of the air layer between the ceiling slab and the ceiling plate. It has been proposed that the surface density of the ceiling panel be 1.28 to 2.4 kg / m ² under 100 mm. Patent Document 3 proposes to construct the finished floor portion of the double floor completely away from the floor slab.

Japanese Unexamined Patent Publication No. 2005-9147 Japanese Patent No. 4736437 JP 2002-317521 JP

  However, in Patent Document 1, it is necessary to make the floor height very large by setting the ceiling air layer to 300 mm or more, and it has become uneconomical in apartment design. In Patent Document 2, in order to eliminate the disadvantages of Patent Document 1, the surface density of the ceiling portion is extremely light with a thickness of 100 mm or less, but this shifts the resonance frequency band from the 63 Hz band to the high frequency side. However, it was not a fundamental improvement proposal for heavy-impact sound cutoff performance (targeting from 63Hz to 500Hz).

  Moreover, in patent document 3, although the method of suspending the floor assembly of an upper floor from the beam part of an upper floor is employ | adopted, the floor of an upper floor tends to shake constantly, and the complexity and economical efficiency of construction are scarce. It is a difficult point.

  In view of the problems of the prior art as described above, the present invention is a method for constructing a sound insulation floor structure that can improve floor impact sound insulation performance of a floor and can construct a double slab with a simple construction at a relatively narrow height. It is another object of the present invention to provide a sound insulation floor structure.

  In order to achieve the above-mentioned purpose, a sound insulation boundary floor structure is constructed in such a manner that a concrete lower slab and an upper slab are arranged with an air layer in between in order to obtain a floor impact sound insulation performance in a floor slab of a building. A method for constructing a floor structure having heavy slabs, characterized in that the double slabs are unitized in advance and attached at the time of building building construction.

  According to this method of building a sound insulation floor structure, a double slab that has been unitized in advance is attached when building a building frame, so that concrete slabs are doubled with an air layer in between, and floor impact A sound insulation floor structure with improved sound insulation performance can be constructed by simple construction at a relatively narrow height.

In the construction method of the sound insulation floor structure, the thickness of the air layer and the surface of the lower slab are set so that the resonance frequency fd when the double slab vibrates is from 44.2 Hz to 88.4 Hz, which is a 63 Hz band, from the low sound side. By setting the density, the double slab can have a relatively narrow height, and a predetermined floor impact sound blocking performance can be realized without unnecessarily increasing the floor height of the building.
However, the resonance frequency fd (Hz) is calculated from the following equation (1).
fd = (1 / (2π)) √ ((m1 + m2) ρc ² / (m1 ・ m2 ・ d)) (1)
d: Air layer thickness (m)
c: Speed of sound (m / s)
ρ: Air density (kg / m ³ )
m1: Area density of the upper slab (kg / m ² )
m2: Lower slab surface density (kg / m ² )

Moreover, it is preferable that the thickness of the air layer is 30 to 100 mm, and the surface density of the lower slab of the double slab is 30 kg / m ² or more.

  In addition, by making the lower slab of the double slab a PC plate with prestressed reinforcement, it is not necessary to support from the other in the support span of the slab while minimizing the air layer between it and the upper slab. It becomes possible.

  Moreover, it is preferable that a spacer is detachably installed between the double slabs at the place where the double slab support is installed, and the double slabs are lifted and attached.

  Preferably, a gasket is attached in advance to the end surface of the lower slab of the double slab, and when the adjacent double slab is installed, the gasket ensures airtightness between the lower slabs.

In order to achieve the above-mentioned purpose, the sound insulation floor structure has a double slab in which a concrete lower slab and an upper slab are arranged with an air layer between them in order to obtain a floor impact sound insulation performance in a floor slab of a building. The floor space structure provided, the resonance frequency fd when the double slab vibrates, the thickness of the air layer and the surface density of the lower slab so that the resonance frequency fd from 44.2 Hz to 88.4 Hz, which is a 63 Hz band, becomes the low frequency side Is set.
However, the resonance frequency fd (Hz) is calculated from the following equation (1).
fd = (1 / (2π)) √ ((m1 + m2) ρc ² / (m1 ・ m2 ・ d)) (1)
d: Air layer thickness (m)
c: Speed of sound (m / s)
ρ: Air density (kg / m ³ )
m1: Area density of the upper slab (kg / m ² )
m2: Lower slab surface density (kg / m ² )

  According to this sound insulation floor structure, the building floor structure is constructed from a double slab made of concrete with an air layer in between, and the thickness of the air layer and the surface density of the lower slab are set appropriately. Thus, the double slab can be made relatively narrow, and a predetermined floor impact sound blocking performance can be realized without unnecessarily increasing the floor height of the building.

In the sound insulation floor structure, it is preferable that the thickness of the air layer is 30 to 100 mm, and the surface density of the lower slab of the double slab is 30 kg / m ² or more.

  According to the present invention, it is possible to provide a method for constructing a sound insulation floor structure capable of improving the floor impact sound insulation performance of the ground floor and constructing a double slab with a relatively narrow height by simple construction, and a sound insulation floor structure. Can do.

It is a principal part side view which shows the sound-insulation boundary floor structure by this embodiment. It is the top view (a) of the building division which installed several PC board which comprises the double slab of FIG. 1, and the top view (b) of the building division which has arrange | positioned the dry double floor on the double slab. It is a flowchart for demonstrating the main processes of the construction method of the sound insulation floor structure by this embodiment. It is a perspective view which shows a mode that the double slab of FIG. 1 is lifted. It is principal part sectional drawing which shows the example of arrangement | positioning of the double slab and formwork in the doorway part of FIG. It is principal part sectional drawing which shows the example of arrangement | positioning of the double slab and formwork in the outer wall part of FIG. It is the figure which cut | disconnected the double slabs 10 and 10 of FIG. 2 in the VII-VII line direction of FIG. FIG. 8 is a view similar to FIG. 7 showing a configuration different from FIG. 7. It is a figure similar to FIG. 7, FIG. 8 which shows fixation and support work of the double slab by the insert of a structure different from FIG. It is a figure (a) which shows the example of calculation of the required floor height of the building in this embodiment, and a figure (b) which shows the example of calculation of the required floor height of the building in a conventional structure. It is a figure which shows the result of having calculated | required the resonance frequency when changing the thickness of an air layer and the surface density of a lower slab in the sound-insulating floor structure of FIG. It is a figure which shows the table | surface which described the value which totaled the thickness of the air layer and the thickness of the lower slab about the combination in the thick line of the table | surface of FIG. 11 corresponding to the table | surface of FIG.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. FIG. 1 is a side view of an essential part showing a sound insulation floor structure according to the present embodiment. 2 is a plan view (a) of a building section in which a plurality of PC boards constituting the double slab of FIG. 1 are installed, and a plan view (b) of a building section in which a dry double floor is disposed on the double slab. is there.

  As shown in FIG. 1, the sound insulation floor structure according to the present embodiment is configured in a floor between an upper floor and a lower floor in an apartment house such as an apartment, and includes a lower slab 11, an upper slab 12, and a lower slab 11. And an upper air slab 12 and an air layer 13 formed in parallel to the slab surface, and a dry double floor 15 disposed above the upper slab 12.

  Between the lower slab 11 and the upper slab 12, spacers 14 are disposed at their ends, and the thickness of the air layer 13 is defined by the spacers 14. The spacer 14 can be formed using, for example, mortar, concrete, or the like when the lower slab 11 and the upper slab 12 are unitized before attaching the frame construction.

  The lower slab 11, the upper slab 12, and the air layer 13 constitute a double slab 10 having excellent floor impact sound blocking performance. That is, the double slab 10 is disposed between the beams B1 and B2, and constitutes the main part of the sound insulation floor structure between the upper floor and the lower floor. Further, as shown in FIG. 1, the upper slab 12 in the double slab 10 constitutes an upper-floor frame slab (structural floor), and the lower slab 11 constitutes a lower-floor ceiling. In addition, a ceiling decorative board etc. are arrange | positioned under the ceiling part.

  The lower slab 11 and the upper slab 12 are formed of a perforated PC board that is lightened by providing a cavity in the longitudinal direction thereof and prestressed. By constructing the lower slab 11 from a perforated PC plate, the air layer 13 between the upper slab 12 and the slab between the beams B1 and B2 is not required to be supported from the other while minimizing the air layer 13 between them. It is.

  As shown in FIG. 2A, a plurality of double slabs 10 are arranged in one section 20 between the door boundary part w1 and the outer wall part w2, and are formed between the longitudinal ends of the upper slabs 12, 12 on the upper surface. After that, concrete is cast into the joint portion 16 and the upper slabs 12 are joined to each other so that a frame slab is constructed, and transmission of the in-plane shear force is ensured.

  Next, as shown in FIGS. 1 and 2B, the dry double floor 15 is constructed on the upper slab 12 in the same section 20 '. For example, as shown in FIG. 1, the dry double floor 15 directly supports a floor plate portion 15 a at a distance from the slab surface 18 and has a plurality of support legs 15 b having a vibration isolating portion 15 c made of rubber or the like on the slab surface 18. It can be a sound insulation dry type double floor arranged and configured. A specific configuration of such a sound insulation dry type double floor is disclosed in, for example, Japanese Patent No. 5670675. In addition, the area | region 17 in the divisions 20 and 20 'of the building of Fig.2 (a) (b) is a surrounding area, such as a kitchen, a bath, and a toilet.

  Next, considerations for securing the high floor impact sound insulation performance and the minimum thickness of the air layer in the sound insulation boundary floor structure of FIG. 1 will be described.

  In general, when there is an air layer 13 between the double slabs 10, the air layer 13 becomes an elastic body, and the vibration shock received by the upper slab 12 is constant depending on the combination of the surface densities of the upper and lower face members (slabs). It becomes a coupled vibration with a resonance frequency.

The resonance frequency fd (Hz) when the double slab 10 vibrates is as follows: the thickness of the air layer 13 is d (m), the sound velocity is c (m / s), the air density is ρ (kg / m ³ ), When the surface density of the slab 12 is m1 (kg / m ² ) and the surface density of the lower slab 11 is m2 (kg / m ² ), the following equation (1) is used.
fd = (1 / (2π)) √ ((m1 + m2) ρc ² / (m1 ・ m2 ・ d)) (1)

According to Equation (1), the upper slab 12 is 200 mm thick reinforced concrete slab, the surface density m1 = 460 kg / m ² , the air density ρ = 1.25 kg / m ³ , the speed of sound c = 340 m / s, and the air layer thickness d The resonance frequency fd when the surface density m2 of the lower slab 11 is changed is as shown in the table of FIG.

  The target frequency band in the heavy impact sound shielding performance test (JIS A 1418-2: 2000) is divided into octaves, from the center frequency of 63Hz to 500Hz, and resonates from the 63Hz band of 44.2Hz to 88.4Hz to the bass side. If the frequency fd is increased, a sound environment that is relatively noisy is felt. The combinations within the bold line in the table of FIG. 11 (the thickness of the air layer 13 and the surface density of the lower slab 11) correspond to the low frequency side of the resonance frequency fd from the 63 Hz band (44.2 Hz to 88.4 Hz). The table of FIG. 12 shows the sum of the thickness of the air layer and the thickness of the lower slab in the grid corresponding to the table of FIG.

  The case shown in bold in the table of FIG. 12 is a case where the resonance frequency deviates from the 63 Hz band to the bass side, and the total of the thickness of the air layer 13 and the thickness of the lower slab 11 is 0.1 m or less. It can be seen that by using a combination in this range, it is possible to expect a sound insulation with a predetermined performance without increasing the floor height.

That is, in the sound insulation boundary floor structure according to the present embodiment, the height of the floor is increased by setting the thickness of the air layer 13 to 30 to 100 mm and the surface density of the lower slab 11 of the double slab 10 to 30 kg / m ² or more. A predetermined floor impact sound insulation performance can be realized without unnecessarily increasing the size.

Actually, the span where the slab is built changes mainly in the range of 6m to 8m in the case of apartment houses. For example, in the case of a lower slab with an 8m span, even if a PC board is used as the lower slab, The thickness may exceed 100 mm, and such PC boards require a corresponding surface density. For this reason, the upper limit of the surface density of the lower slab 11 is not particularly set, and the surface density of the lower slab 11 may be 30 kg / m ² or more.

  According to the sound insulation floor structure according to the present embodiment, the predetermined resonance frequency in the double slab 10 is avoided and the slabs 11 and 12 having weight and rigidity are arranged, so that the lower slab 11 of the upper slab 12 is caused by the floor impact. The acoustic radiation from the lower surface can be markedly shielded, and excellent floor impact sound blocking performance can be exhibited.

  Next, the construction method of the sound insulation floor structure as shown in FIGS. 1 and 2 will be described with reference to FIGS. FIG. 3 is a flowchart for explaining the main steps of the method for constructing the sound insulation floor structure according to this embodiment. FIG. 4 is a perspective view schematically showing how the double slab of FIG. 1 is lifted.

  As shown in FIG. 3, first, the double slab 10 of FIG. 1 is unitized (S01). In a factory or the like, the lower slab 11 and the upper slab 12 are overlapped, and mortar or concrete is arranged and integrated between them while maintaining a predetermined interval. Mortar and concrete are arranged in the vicinity of both ends in the longitudinal direction as shown in FIGS. 1 and 4 and form a spacer 14 after solidification. The spacer 14 ensures the thickness d of the air layer 13 between the lower slab 11 and the upper slab 12.

  The lower slab 11 and the upper slab 12 can be formed of a perforated PC board with prestressed reinforcement. Specifically, for example, a product name “Spancrete” (registered trademark) from one of the applicants of the present application is used. ), A concrete panel having a plurality of hollow holes in the longitudinal direction (longitudinal direction) and prestressed by a PC steel wire can be used (see FIGS. 7 and 8).

  In order to support the double slab 10 during construction, a support is provided at a predetermined position in the span of the double slab 10 (S02).

  Next, as shown in FIG. 4, the unitized double slab 10 is lifted using a crane (not shown) with a rope, a wire 30 or the like (S03), and a mold installed for constructing a beam or the like. Attach to a predetermined position near the frame (S04). A predetermined number of double slabs 10 are attached as shown in FIG.

  Next, concrete is placed in the mold (S05), and the double slab 10 is integrated with the beams B1 and B2 (FIG. 1). At this time, concrete is also placed in the joint portion 16 extending in the longitudinal direction between the double slabs 10 and 10 of FIG.

  Next, as shown in FIG. 1, the dry double floor 15 is installed on the slab surface 18 of the completed upper slab 12 (S06).

  As described above, the double slab 10, which is a floor board unit composed of two upper and lower sheets, is manufactured at a factory or the like before being installed on site, and is sequentially attached to a predetermined place on the construction floor, and concrete is placed on the construction floor. Thus, the double slab 10 is integrated with the surrounding beams.

  As described above, the sound insulation floor structure according to the present embodiment of FIG. 1 can be constructed in a building of an apartment house such as an apartment. This sound insulation floor structure can secure the floor impact sound insulation performance of the upper and lower floors of buildings, especially apartment buildings such as condominiums. However, according to the construction method of the sound insulation floor structure of this embodiment, the sound insulation performance of the floor insulation is ensured. An effective construction method can be provided. That is, since a double slab that is unitized in advance is used for building a building structure, a concrete lower slab 11 and an upper slab 12 are arranged in a double layer with an air layer 13 in between, and floor impact sound blocking performance is achieved. It is possible to construct a sound-insulating boundary floor structure with improved simple construction with a relatively narrow height.

  Next, with reference to FIGS. 5 and 6, an example of the arrangement of the double slabs and the molds in the door boundary and the outer wall of FIG. 1 will be described. FIG. 5 is a cross-sectional view of an essential part showing an arrangement example of double slabs and molds in the doorway part of FIG. FIG. 6 is a cross-sectional view of an essential part showing an arrangement example of the double slab and the mold in the outer wall part of FIG.

  As shown in FIG. 5, the beam form frame 33 corresponding to the doorway portion w <b> 1 is disposed on the inner side so as to surround the plurality of main bars 31 extending in the beam longitudinal direction (perpendicular to the paper surface) and the plurality of main bars 31. A plurality of shear reinforcement bars 32 are arranged, assembled using a mold assembly metal fitting 34, and supported from below by a mold support 37. The double slab 10 is attached in the vicinity of the beam form frame 33, and their ends constitute a part of the beam form frame 33. The double slab 10 is supported in the vicinity of the beam formwork 33 by a support 36 extending from the lower floor via a receiving portion 36a.

  As shown in FIG. 6, the beam form frame 43 corresponding to the outer wall portion w <b> 2 is arranged inside the plurality of main bars 41 extending in the beam longitudinal direction (perpendicular to the paper surface) and surrounding the plurality of main bars 41. A plurality of shear reinforcement bars 42 are arranged, assembled using a mold assembly fitting 44, and supported from below by a mold support 45. The double slab 10 is attached close to the beam form frame 43, and one end thereof constitutes a part of the beam form frame 43. The double slab 10 is supported in the vicinity of the beam form frame 43 by a support 46 via a receiving portion 46a. The support structure 46 is supported by the slab surface 18 on the lower floor and extends upward.

  As shown in FIG. 6, the double slab 10 is supported by a support 47 provided in the middle according to the span. The support 47 is inserted into the insert 48 provided in the double slab 10 to support the double slab 10. The insert 48 penetrates the upper slab 12 and the lower slab 11, and the through bolt 48 a so as to abut on the lower surface of the lower slab 11 and the upper surface of the upper slab 12 of the outer surface of the double slab 10. Nuts 48b and 48b to be screwed into the nuts, and nuts 48c and 48c to be screwed into the through bolts 48a so as to contact the upper surface of the lower slab 11 and the lower surface of the upper slab 12 on the inner surface (air layer 13 side) of the double slab 10, respectively. Have. The nuts 48b, 48b, nuts 48c, 48c are screwed into the through bolts 48a, and the insert 48 is fixed to the double slab 10, and the positions of the nuts 48b, 48b, nuts 48c, 48c are adjusted, whereby the air layer 13 The thickness d can be finely adjusted. Thus, the insert 48 functions as a spacer that keeps the thickness d of the air layer 13 constant.

  By inserting the upper end portion 48d and the lower end portion 48e of the through bolt 48a into the holes in the end portions of the support members 47, 47, the double slab 10 is inserted into the double slab 10 in advance in the middle of the span. It is securely supported via

  In addition, the unitization and integration of the double slab 10 can be ensured by providing the insert 48 in advance at the position where the support 47 is arranged in the double slab 10. After the construction, the support 47 is removed, and the insert 48 is removed and removed. The insert 48 serves as a spacer during construction of the sound insulation floor structure. Further, the insert 48 may be applied to the end portion of the lower slab 11 to replace the spacer 14. In this case, a concrete stop at the time of placing the concrete on the beam form is provided at the end of the double slab 10 as necessary.

  In the placing step S05 in FIG. 3, concrete is placed in the beam form frame 33 in FIG. 5 and the beam form frame 43 in FIG. 6, so that the beams B1 and B2 constituting a part of the building structure of the building (FIG. 1). ) And the double slab 10 can be integrated with the beams B1 and B2 (FIG. 1). In this process, concrete is cast in the joint portion 16 between the double slabs 10 and 10 in FIG. 2 and the upper slabs 12 and 12 are joined. Next, the joint portion between the double slabs 10 and 10 is joined. The joining example of the upper slabs 12 and 12 and the lower slabs 11 and 11 in FIG.

  FIG. 7 is a view of the double slabs 10 and 10 of FIG. 2 cut along the line VII-VII of FIG. As shown in FIG. 7, the upper slab 12 of the double slab 10 has a recess 12 a formed at the end thereof, a butting portion 12 b formed at the lower side of the end, and when the double slabs 10 and 10 are butted together, The butted portions 12b and 12b come into contact with each other, and a space is formed by the recesses 12a and 12a. In the placing step S05 in FIG. 3, the upper slabs 12 and 12 of the double slab 10 are joined by filling the space formed by the recesses 12a and 12a with concrete.

  Further, the lower slab 11 of the double slab 10 has a concave portion 11a formed at one end and a convex portion 11b formed at the other end. When the double slabs 10, 10 are brought into contact with each other, the concave portion 11a and the convex portion 11b are formed. It is designed to fit together. The lower slabs 11, 11 are joined by the tongue fitting portions and the air layer 13 is sealed, so that the airtightness between the lower slabs 11, 11 can be ensured.

  FIG. 8 is a view similar to FIG. 7 showing a configuration different from FIG. As shown in FIG. 8, the upper slab 12 of the double slab 10 has the same configuration as that of FIG. 7, but a substantially flat flat portion 11c is formed at the end of the lower slab 11, and rubber or the like is formed at one end. A hollow packing 23 made of an elastic body is affixed in advance with an adhesive or the like. When the double slabs 10 and 10 are brought into contact with each other, the flat portions 11c and 11c come into contact with each other via the packing 23. The end portions of the lower slabs 11, 11 are sealed by the packing 23, and the air layer 13 is sealed, so that airtightness between the lower slabs 11, 11 can be ensured.

  Further, the packing 23 is pressed between the flat portions 11c and 11c, so that a part of the packing 23 protrudes toward the air layer 13 and comes into contact with the lower surface of the upper slab 12, thereby forming a substantially spherical protruding portion 23a. Since the protruding portion 23a is located below the abutting portions 12b and 12b of the upper slab 12, the joint portion 16 of the upper slabs 12 and 12 exhibits a function of stopping at the time of placing concrete.

  7 and 8, the lower slab 11 and the upper slab 12 have a plurality of hollow holes 21 extending in the longitudinal direction (perpendicular to the paper surface), and a plurality of PC steels embedded in the concrete. Prestress is provided by the line 22.

  Next, the fixing and supporting work of the double slab with an insert having a configuration different from that of FIG. 6 will be described with reference to FIG. FIG. 9 is a view similar to FIG. 7 and FIG. 8 showing the fixing and supporting work of the double slab with an insert having a configuration different from that of FIG.

  As shown in FIG. 9, inserts 49 are provided at both ends of the double slab 10 in the short direction. The insert 49 includes a bolt 49a, nuts 49b and 49b that are screwed into the bolt 49a so as to contact the upper surface of the lower slab 11 and the lower surface of the upper slab 12 on the inner surface (air layer 13 side) of the double slab 10, respectively, And a nut 49c that is screwed to come into contact with the lower surface of the slab 11. The bolt 49 a has an upper end 49 d inserted into a bottomed hole 50 formed in the lower surface of the upper slab 12 and fixed by a nut 49 b, penetrates the lower slab 11, and nuts on the upper and lower surfaces of the lower slab 11. It is fixed by 49b and 49c. By adjusting the positions of the nuts 49b, 49b, and the nut 49c, the thickness d of the air layer 13 can be finely adjusted.

  The double slab 10 is securely supported through the insert 49 provided in advance in the double slab 10 by inserting the lower end 49e of the bolt 49a into the hole in the end of the support 51 extending from the lower floor side. Is done. In addition, in the upper position of the insert 49, the support work 52 is installed so as to extend from the upper surface of the upper slab 12 to the upper floor side.

  The insert 49 of FIG. 9 is removed after the support 51 is removed after construction, and the bolts 49a are removed from below. The insert 49 plays the role of a spacer during the construction of the sound insulation floor structure, like the insert 48 of FIG. In FIG. 9, the bolt 49 a passes through the lower slab 11 and penetrates into a part of the upper slab 12. Conversely, the bolt 49 a penetrates through the upper slab 12 and penetrates into a part of the lower slab 11. In this case, the bolt 49a is removed from above. The insert 49 may also be applied to the end of the lower slab 11 to replace the spacer 14. In this case, a concrete stop at the time of placing the concrete on the beam form is provided at the end of the double slab 10 as necessary.

  Next, an example of calculating the required floor height of a building when the sound insulation floor structure according to the present embodiment is employed will be described with reference to FIG. FIG. 10A is a diagram illustrating an example of calculating the required floor height of the building in the present embodiment, and FIG. 10B is a diagram illustrating an example of calculating the required floor height of the building in the conventional structure.

  If the height from the floor surface to the ceiling decorative board is constant in both as shown in FIGS. 10 (a) and 10 (b), the overall floor height is slightly higher than the conventional structure in the sound insulation boundary floor structure of this embodiment, There is no installation of a floor slab step in the water area 17 (FIG. 2), and the height can be secured higher than in the conventional structure. According to the sound insulation floor structure, the double slab 10 can provide a floor impact sound insulation performance superior to that of the conventional structure. In consideration of the above, it can be said that the sound insulation boundary floor structure of this embodiment is appropriate when priority is given to the floor impact sound insulation performance even if the overall floor height is slightly increased.

  As described above, the modes for carrying out the present invention have been described. However, the present invention is not limited to these, and various modifications can be made within the scope of the technical idea of the present invention. For example, the sound insulation floor structure according to the present embodiment is suitable for an apartment house such as a condominium, but the present invention is not limited to this, and an office building, a hotel, a hospital, a school, a sports facility, a music hall / studio, etc. Needless to say, it can be applied to various buildings and particularly to parts requiring high floor impact sound insulation performance.

  In the sound insulation floor structure of the present embodiment, the sound insulation dry type double floor 15 as shown in FIG. 1 is installed on the double slab 10, but the present invention is not limited to this, for example, other types. Of course, it may be a dry double bed or various synthetic beds.

  Further, the unitization of the double slab 10 is not limited to a factory, and may be performed, for example, at a construction site of a building.

  According to the sound insulation floor structure construction method and the sound insulation floor structure of the present invention, the workability is good and it is easy to ensure the floor impact sound insulation performance on the building floor. For example, living in an apartment house such as a condominium It can contribute to the elimination of complaints about sound.

DESCRIPTION OF SYMBOLS 10 Double slab 11 Lower slab 12 Upper slab 13 Air layer 14 Spacer 15 Dry type double floor 16 Joint part 21 Hollow hole 22 PC steel wire 23 Packing 33, 43 Beam formwork 36, 46, 47 Support 48 Insert 48a Through bolt 49 Insert 49a Bolt 51, 52 Supporting work

Claims (8)

A method for constructing a boundary floor structure comprising a double slab in which a concrete lower slab and an upper slab are arranged with an air layer interposed therebetween to obtain a floor impact sound insulation performance in a floor slab of a building,
A construction method of a sound insulation floor structure, characterized in that the double slab is unitized in advance and attached when building a building. The thickness of the air layer and the surface density of the lower slab are set so that the resonance frequency fd when the double slab vibrates is from 44.2 Hz to 88.4 Hz, which is a 63 Hz band, on the low frequency side. To build a sound insulation floor structure.
However, the resonance frequency fd (Hz) is calculated from the following equation (1).
fd = (1 / (2π)) √ ((m1 + m2) ρc ² / (m1 ・ m2 ・ d)) (1)
d: Air layer thickness (m)
c: Speed of sound (m / s)
ρ: Air density (kg / m ³ )
m1: Area density of the upper slab (kg / m ² )
m2: Lower slab surface density (kg / m ² ) The method for constructing a sound insulation floor structure according to claim 1 or 2, wherein the thickness of the air layer is 30 to 100 mm, and the surface density of the lower slab of the double slab is 30 kg / m ² or more.   The construction method of a sound insulation floor structure according to any one of claims 1 to 3, wherein the lower slab of the double slab is a PC plate with prestressed reinforcement.   The sound insulation floor structure according to any one of claims 1 to 4, wherein a spacer is removably installed between the double slabs at a place where the double slab support is installed, and the double slabs are lifted and attached. How to build.   The gasket according to any one of claims 1 to 5, wherein a gasket is attached in advance to an end surface of the lower slab of the double slab, and the airtightness between the lower slabs is secured by the gasket when the adjacent double slab is installed. A construction method of the sound insulation floor structure described in 1. A floor structure comprising a double slab in which a lower slab made of concrete and an upper slab are arranged with an air layer therebetween to obtain a floor impact sound insulation performance in a floor slab of a building,
The thickness of the air layer and the surface density of the lower slab are set so that the resonance frequency fd when the double slab vibrates is on the low sound side from 44.2 Hz to 88.4 Hz which is a 63 Hz band. Sound insulation floor structure.
However, the resonance frequency fd (Hz) is calculated from the following equation (1).
fd = (1 / (2π)) √ ((m1 + m2) ρc ² / (m1 ・ m2 ・ d)) (1)
d: Air layer thickness (m)
c: Speed of sound (m / s)
ρ: Air density (kg / m ³ )
m1: Area density of the upper slab (kg / m ² )
m2: Lower slab surface density (kg / m ² ) The sound insulation floor structure according to claim 7, wherein the thickness of the air layer is 30 to 100 mm, and the surface density of the lower slab of the double slab is 30 kg / m ² or more.

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